Pulley



Nov. 1,9, 1929. H. A. TouLMl, JR

PULLEY Filed April so. 192e Patented Nov, `19, 1929 wenn asie e y HARRY A: TOULMIN, JR., OF DAYTON, OIIIO, ASSIGNOR TO vTHE DAYTON RUBBER i MANUFACTURING COMPANY, 0F DAYTON, OI-IIO, A CORPORATION OF OHIO PULLEY Y Appiication med` Aprn so,

My invention relates to pulleys.

Tt is the object of my invention to provide a pulley adaptable particularly tor use with a V -shaped belt of trapezoid sectionl and, in particular, with a raw-edged belt which is composed of rubber and fabric with the edges or sides of the fabric exposed in the'side of the belt. l

It is a particular object of my invention to provide means by which the variations in load of the initial application of load may be taken up without putting undue strain upon the belt, particularly that type of belt which has a non-extensible, neutral axis and upon whichthe strains of starting and variation in load are particularly severe due to the lack of extensible or yieldable characteristicsy of the neutral axis.

Referring to the drawings: Y

Figure 1 is a side elevation of a pulley partially broken away;

Figure 2 is an broken away; i

Figure 3 'is a Vdetail of a vdetachable stop member. y

Referring to the drawings in detail, my invention consists primarily of a supporting portion, a belt engaging portion slidable thereon, and .means to yieldingly resist the relative movement of the two portions in orend elevation partially vder that any undue strain or eXtrav load due to starting or applying the load on driving members or driven members may be compensated for by the relative movement between the supporting portion and the belt engaging portion of the pulley. In the drawings1 and 2 designate opposite similarly formed halves of a pulley which are joined together by the bolts 3. The nuts 4 and washers 5 serve to retain the halves to` gether on the bolts 3. Y V

The peripheral portions of these' halves have a segmental cutaway portion 6, such segl ments together forming a semi-circular depression in the periphery of the pulley.

This depression is lled by a ring 7 constituting the belt engaging portion of the pulley whose inner face is semi-circular as at 8 to it within the semi-circular groove of the supporting portions l and 2 of the pulley.

192s. Serial No. 273,867.

The tricti/onalv engagement between these 7V two portions serves to resist the movement one over the other, but, in lorder to supplement Althis'frictional resistance and to positively limit, the actualfamount ofl relative.l movement between the parts, I provide the therein by meansof the threaded shaft 10.

This lug extendsinto an arcuate cutaway portionll formed inthe base otthe'semicircular groove on the periphery of the supe' porting portion ot the pulley.

Between the sides of the stop of the arcuate groove 11,1v locate helical Vsprings 12 which serve to fresist vthe relative i 270 9and the ends i movement between the belt supporting portion of the pulley and-thesupporting portion of the pulley therefor. This belt supporting portion has a groove for receiving the so-l called V-shaped groove, such groove being trapezoid in section and designated 13. vThe pulley itself is mounted in any desired lform,

such as thekey 14 on the shaft 15 which supports it. l.

'WhenV the load is first applied, the vbelt engaging the belt supporting portion U7 'will cause it to trav'el'relative to the supporting halves` .1 andi 2 Vcompressing the spring. 12,

Y but, as soon as the load has been-taken up and momentumzhas been gained so that the lparts are in running condition, thespring' l2 will gradually,expand and ,restore itself to4 its original neutral position. Variations in load, as where belts and pulleys are driving rock crushers,.and.rock is suddenly put `into the Crusher and runs between the jaws,` will be likewise taken up, thus relieving-the strain upon the.belt,.preventingtheslip of the belt with the lconsequent generation of heat and I deterioration of the belt.

It will be understood'that ldesire toconi-I- pretend within my invention auch modificalo@v tions as may be necessary to adapt it to varying conditions and uses. f

Having thus fully described my invention, desire to secure by Letters Patent, is:

' 1. In a pulley, va supporting portion formed 1 0f oppositely disposed circular halves, a relaf.

tively movable belt engaging ring portion, and means for limiting the .relative movement of said portions one Vto the other.

2. In a pulley, a supporting portionv formed y of oppositely disposed circular halves, a relatively movable belt engaging ring portion, and means for limiting the relative movement of said portions one to the other yieldingly. l 1

3. In combination, in apulle'y, a supporting portion havingl a peripheral groove with arcuate slots therein, a belt engaging portion with lugs in vsaid slots adapted vto move therein hav-ing an linner face of corresponding section of said ,groove and `anouter face suitably groovedlor receiving a belt.

4. In combination, in a pulley, a supporting portion having a peripheral groove, a belt engaging portionfadapted to move 'therein having an inner a'ceof corr'espondi'ngv4 'secof said groove in said plates, and yieldingV means engaging said depending members on either side of the end walls of said groove of said slots.

In testimony whereof, I alix my signature. V HARRY A. TOULMIN, JR.

tion 'of said groove andan outer lace suitably i grooved for receiving a belt, 'said groove for receiving the belt being trapezoifd in section, the sides of which are adapted to-,engage with the sides of the belt. ,h

5. In combination, in a pulley, a supporting .portion having a peripheral groove, a belt engaginga portion adapted to move therehaving an inner face of corresponding `sec- Y Vtion of said grooveand an 'outer face suitably grooved for receiving a belt, 'said groove'for receiving the belt being trape'zoid in section, the vsides of which are adapted to engage with the sides of the belt, and means for limiting the relative movement between the belt engaging portion and the supporting portion therefor. Y

, 6. In combination in pulley, a supportking portion having a l'peripheral.,'f ,rroove,a

' belt vengaging portion adapted to be 'slidably mounted therein, 'said belthavin'g an outer belt receiving groove, depending members on the inner side ol said belt engaging portion depending into arcuate grooves in the supporting portion, and yielding means interposed between the 'ends of )said said iep-ending 'member sides.

7. In a pulley,a`pai`r of ladjacent supporting plates having a groove .in the outer tace thereof formed partially in lea'ch of said v plates, the outer margins ci? sai-d plates havingsi'de walls for forming the margin oif said groovanieans of attaching saidV plates one to the other, a belt engaging ringhaw ing an inner yvv-all conforming te said groove, said ringbeing mounted thereim'depending members depending from .saidinner vvall of sai-l ring into 'arcuate sletsxformed in the easeV aes .flic

Yg'moves and i ils las

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